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Sodium hydroxide dissolves in water

Physical

Hydrochloric acid reacts with potassium hydroxide to produce a salt, water, and heat

Chemical

A pellet of sodium is sliced in two

Physical

Water is heated and changed to steam

Physical

Potassium chlorate decomposes to potassium chloride and oxygen gas

Chemical

Iron rusts

Chemical

When placed in H2O, a sodium pellet catches on fire as hydrogen gas is liberated and sodium hydroxide forms

Chemical

Evaporation

Physical

Ice melting

Physical

Milk sours

Chemical

Sugar dissolves in water

Physical

Wood rotting

Chemical

Pancakes cooking on a griddle

Chemical

Grass growing in a lawn

Chemical

A tire is inflated with air

Physical

Food is digested in the stomach

Chemical

Water is absorbed by a paper towel

Physical

Gasoline burning

Chemical

Lighting a match

Chemical

Chopping Wood

Physical

Breath fogging a mirror

Physical

Cooking an egg

Chemical

Bleaching a stain

Chemical

Physical Changes are

changes in which the identity of a substance doesn't change but the arrangement, location, and speed that make up the substance may change)

Chemical Changes are

changes in which the identities of substances change and new substances form

Evidences of Chemical Changes are

the evolution of gas, the formation of precipitate, the release or absorption of energy, or color change in the reaction system

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